Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1971__3_133843, author = {M.S. Putcha}, title = {Commutative semigroups whose homomorphic images in groups are groups.}, journal = {Semigroup forum}, pages = {51--57}, publisher = {mathdoc}, volume = {3}, year = {1971}, zbl = {0235.20058}, url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133843/} }
M.S. Putcha. Commutative semigroups whose homomorphic images in groups are groups.. Semigroup forum, Tome 3 (1971), pp. 51-57. http://geodesic.mathdoc.fr/item/SF_1971__3_133843/